And for those you don't read French, and asked me, here is something in English :

The REVOLUTION (trademark) type kites are the simplest kites to build. Only the bridles needs more attention.

You need five 79 cm bar. 3 for the horizontal spread (connected together).

May be 2 would be all right, but it's more practicle to fold up in a bag.

And 2 more for the vertical bars. Of course standard carbon tube could be use (use 8 mm diameter for the horizontal and 6 mm diameter for the vertical) but prefer AVIA or SKYSHARK or why not the REVOLUTION ultralight kit (120 FF each in France !.. Lucky you are in U.K or U.S).

sorry if the blue sheet are not fully translated.

Please pay attention to the leading edge wich is not horizontalans describes a  light curve.